Scenario: I had my rear bumper replaced with an Mtech 'aftermarket' bumper at a local bodykit shop. Simple plug and play method. No re-wiring whatsoever.

Problem: When I reverse, I noticed that my PDC sounds off (beeps intermitently)
even WITHOUT any obstacle at my back. The rear view is totally clear. This has not happened to me before I changed the rear bumper.

What I did: I brought it to BMW
- Computer check diagnosis - No fault
- Cleaning of all sensors and wiring
- Replaced the Sensors with new ones

The intermitent beep is still there! Its impossible to be the wiring as the bumper installer did not touch the wirings.

This is really strange as we do not what has caused it, therefore they cannot fix it until they diagnose the problem.